Phosphoric acid (h3po4) has pka values of 2.14, 6.86 and 12.4. over what range of ph values would a solution containing both h2po4 - and hpo4 2- be an effective buffer?

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Which element is the least metallic between cadmium, silver, zinc, or iron?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: